package com.ixuestar.wxutil;

import java.io.UnsupportedEncodingException;
import java.security.AlgorithmParameters;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
import java.security.spec.InvalidParameterSpecException;
import java.util.Arrays;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Base64;

import com.alibaba.fastjson.JSONObject;

public class GetwxMobilenumber {
	
	//定义小程序的appId
	public static final String APPID_STRING = "wx094594141089df71";
	//定义小程序的SECRET
	public static final String SECRET_STRING = "8910309d4cff5d1338516246ed91e648";
	//定义小程序grant_type
	public static final String grant_type = "authorization_code";
	
	
    /**
     * @method 获取微信的sessionKey
     * @param code
     * @return
     * @throws Exception
     */
    public static JSONObject getWxSessionKey(String code,String appId,String appSec) throws Exception {
        //官方接口，需要自己提供appid，secret和js_code
        String requestUrl = "https://api.weixin.qq.com/sns/jscode2session?appid="+APPID_STRING+"&secret="+SECRET_STRING+"&js_code="+code+"&grant_type="+grant_type;
        //获取返回参数
        String codeObjectString = new HttpRequestor().doGet(requestUrl);
        System.out.println("-----codeObjectString--"+codeObjectString+"----------");
        
        JSONObject oppidObj = JSONObject.parseObject(codeObjectString);
        //获取sessionKey
        String session_key = (String) oppidObj.get("session_key");
        oppidObj.put("wxSessionKey", session_key);
        oppidObj.remove("session_key");
        return oppidObj;
    }

    
    /**
     * @method 获取微信用户的手机号
     * @param encryptedData
     * @param sessionkey
     * @param iv
     * @return
     */
    public static JSONObject getWxTelephone(String encryptedData,String sessionkey,String iv){
        // 被加密的数据
        byte[] dataByte = Base64.decode(encryptedData);
        // 加密秘钥
        byte[] keyByte = Base64.decode(sessionkey);
        // 偏移量
        byte[] ivByte = Base64.decode(iv);
        try {
               // 如果密钥不足16位，那么就补足.  这个if 中的内容很重要
            int base = 16;
            if (keyByte.length % base != 0) {
                int groups = keyByte.length / base + (keyByte.length % base != 0 ? 1 : 0);
                byte[] temp = new byte[groups * base];
                Arrays.fill(temp, (byte) 0);
                System.arraycopy(keyByte, 0, temp, 0, keyByte.length);
                keyByte = temp;
            }
            // 初始化
            Security.addProvider(new BouncyCastleProvider());
            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS7Padding","BC");
            SecretKeySpec spec = new SecretKeySpec(keyByte, "AES");
            AlgorithmParameters parameters = AlgorithmParameters.getInstance("AES");
            parameters.init(new IvParameterSpec(ivByte));
            cipher.init(Cipher.DECRYPT_MODE, spec, parameters);// 初始化
            byte[] resultByte = cipher.doFinal(dataByte);
            if (null != resultByte && resultByte.length > 0) {
                String result = new String(resultByte, "UTF-8");
                return JSONObject.parseObject(result);
            }
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
        } catch (NoSuchPaddingException e) {
            e.printStackTrace();
        } catch (InvalidParameterSpecException e) {
            e.printStackTrace();
        } catch (IllegalBlockSizeException e) {
            e.printStackTrace();
        } catch (BadPaddingException e) {
            e.printStackTrace();
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (InvalidKeyException e) {
            e.printStackTrace();
        } catch (InvalidAlgorithmParameterException e) {
            e.printStackTrace();
        } catch (NoSuchProviderException e) {
            e.printStackTrace();
        }
        return null;
    }
	

}
